# What is the standard form of y=(2x+4)^{2}-(x-7)^{2}?

What is the standard form of $y={\left(2x+4\right)}^{2}-{\left(x-7\right)}^{2}$?
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Explanation:
Expand using the binomial theorem
$y=\left(4{x}^{2}+16x+16\right)-\left({x}^{2}-14x+49\right)$
$y=3{x}^{2}+30x-33$
$y=3{x}^{2}+30x-33$